非均匀月壤介质的被动微波辐射传输模拟

基于非均匀月壤物理模型和辐射传输方程,模拟月壤介质中的微波辐射传输特性,探讨频率、月壤厚度等与月表亮温的关系。结果表明:在低频段,月壤微波辐射亮温的动态变化范围较大,可探测的月壤厚度大,3 GHz时的最大可探测月壤厚度达12.4 m;在高频段对应的可探测月壤厚度较小,特别是从50GHz往后的频率段内,最大可探测月壤厚度均小于2 m。不同频率的亮温-厚度变化曲线没有交叉点,且频率越高,所能探测的月壤厚度越小。根据模拟结果,建立了月壤厚度与亮温的查找表。基于查找表,利用单个波段的亮温数据即可得到月壤厚度信息。

Simulation on Passive Microwave Radiative Transfer in Inhomogeneous Lunar Regolith

Based on radiative transfer equation and geometric spatial model,the mechanism of the microwave radiation transfer in the inhomogeneous lunar regolith is simulated.The results indicate that low frequencies are good for the simulation on passive microwave radiative transfer in the lunar regolith.The differences of the microwave radiation brightness temperature of lunar regolith in low frequency is much bigger,and the corresponding detectable thickness is much deeper than those in high frequency for exanvples in 3 GHz,the maximum detectable thickness is up to 12.4 m.The maximum detectable thickness of lunar regolith declines drastically with the increasing of the frequency.And the detectable lunar regolith thickness in high frequency is falling into the detectable range of that in low frequency.Based on the results,a look-up table between lunar regolith thickness and brightness temperature is established.The lunar regolith thickness can be obtained from the observed single-channel brightness temperature using the look-up table.